Sagot :
Bonjour,
-2x+1 <= 0
-2x <= -1
x <= (-1)/(-2)
x <= 1/2
2x+4 <= 0
2x <= -4
x <= (-4)/2
x <= -2
J'espère que tu as compris
A+
-2x + 1 ≤ 0
-2x ≤ -1
x ≤ (-1)/(-2)
x ≤ 1/2
2x+4 ≤ 0
2x ≤ -4
x ≤ (-4)/2
x ≤ -2
voilà :)